I mean, they have vibrating but plugs, that can be controlled remotely by an app. Each move would be instructed with 2 number pairs. Each pair represents a square on the board- normally they’re identified by letters running left to right (from white’s perspective,) a-h, and a number 1-8 (white’s home row is 1).

The first pair is the starting position, the second pair is the final position, so you pulse out four numbers with a pause between them, and that communicates the move.

The person with the remote app (that can be used across the internet, for the record,) watched a live feed and plugs in the move an opponent makes, and reports back the chess ai’s move.

Bzzt-bzzt—bzzt-bzzt-bzzt-bzzt-bzzt—bzzt-bzzt-bzzt—bzzt-bzzt-bzzt-bzzt-bzzt-

Would instruct a move from the pawn in E2 to move to e3,

Just a guess; though, these guys just wanted to shove a vibrator up their ass… no judgment.